Skip to content
Day 69: new resources are added every day. See what's new
Best Productivity ResourcesBy Shushant LakhyaniVerified creator

Mac App

simslim

Run more iOS simulators on one Mac by disabling background daemons the simulator does not need.

Visit simslim4.5

  • Rating

    4.5 / 5

  • Pricing

    Free

  • Difficulty

    Advanced

  • Works on

    macOS

Built with love by Shushant Lakhyani. Building bestproductivityresources.com

Free: 1,100+ ways people make money onlineFree: 399+ ways to make money online

What is simslim?

simslim is a Go-based utility that trims the memory and CPU overhead of the iOS Simulator by disabling background daemons a simulator does not need, so you can run more simulator instances on a single Mac. It is built for iOS developers and CI machines that juggle many devices at once and hit resource limits long before Xcode does.

Third-party open-source projects. We are not affiliated with their authors; repositories are provided as-is by their maintainers. Review each project's license, code and security before installing. See our Disclaimer.

Pros: what simslim does well

  • Lets one Mac run far more iOS simulators in parallel
  • Simple command-line approach, no complex setup
  • Open source with an active community of iOS developers

Cons: where it falls short

  • macOS only, and aimed squarely at iOS developers
  • Disabling daemons can change simulator behaviour, so test before CI use
  • Requires comfort with the command line

Who simslim is for

iOS developers and CI operators who need many simulators running on a single Mac.

Who can skip it

Developers who only ever run one simulator at a time.

simslim alternatives

Not sold on simslim? These do a similar job, and each card says what it has in common.

All Workflows resources

Watchexec

Focus: file watcher, automation and command line. Shares developer tools and open source with simslim. An automation tool, not a Mac app. Same 4.5 rating.

Automation ToolFreeCross-Platform
4.5Visit

entr

Focus: file watcher, automation and command line. Shares developer tools and open source with simslim. An automation tool, not a Mac app. Rated 4.4 (simslim: 4.5).

Automation ToolFreeCross-Platform
4.4Visit

iTerm2

Focus: terminal, mac and command line. Shares open source with simslim. Rated 4.7 (simslim: 4.5).

Mac AppFreemacOS
4.7Visit

Karabiner-Elements

Focus: keyboard remapping, shortcuts and hyper key. Shares open source with simslim. Rated 4.7 (simslim: 4.5).

Mac AppFreemacOS
4.7Visit

Hammerspoon

Focus: mac automation, window management and lua scripting. Shares open source with simslim. Adds Offline. Rated 4.6 (simslim: 4.5).

Mac AppFreemacOS, Offline
4.6Visit

Free alternatives to simslim

Want to spend nothing? These free picks cover similar ground.

Emulate

Focus: api emulation, testing and vercel. Shares ci and open source with simslim. A framework, not a Mac app. Rated 4.4 (simslim: 4.5).

FrameworkFreeCross-Platform
4.4Visit

Dive

Focus: ai agents and framework. Shares go and developer tools with simslim. A framework, not a Mac app. Rated 4.3 (simslim: 4.5).

FrameworkFreeCross-Platform
4.3Visit

AutoHotkey

Focus: hotkeys, macros and scripting. Shares open source with simslim. A desktop app, not a Mac app. Adds Windows and Offline. Rated 4.7 (simslim: 4.5).

Desktop AppFreeWindows, Offline
4.7Visit

Coolify

Focus: self-hosting, deployment and hosting. Shares open source with simslim. A web app, not a Mac app. Adds Web. Rated 4.7 (simslim: 4.5).

Web AppFreeWeb
4.7Visit

Microsoft PowerToys

Focus: launcher, command palette and windows utilities. Shares open source with simslim. A Windows app, not a Mac app. Adds Windows. Rated 4.7 (simslim: 4.5).

Windows AppFreeWindows
4.7Visit
Are you the maker of simslim?Get a free Featured badge for your site, a share image and ready-to-paste posts. No sign-up.

New · updated daily

What people are actually doing with AI

Real use cases shared on Reddit, Hacker News, X, GitHub and blogs, summarised in plain words with a link to every original post.

Browse AI use cases

Free Notion database

1,100+ ways people are making money online

Real online businesses, creators and projects, broken down by how they make money: apps, online stores, AI tools and more. Free on Gumroad.

Get the free database

Free Notion database

399+ ways to make money online

Hundreds of online income methods in one place, so you can compare options and pick one to try. Free on Gumroad.

Get the free list

For research and ideas only. Results vary and nothing here is a promise of income. See our Disclaimer.

Weekly newsletter

Everything new, every Monday.

One short email every Monday with everything shipped that week: new free tools and websites, new guides, new free browser tools and what's new in my free Gumroad libraries, plus how the site is growing. Free, and you can unsubscribe anytime.

Join the newsletter

You sign up on Gumroad, which stores your email to send the newsletter. See our Privacy Policy.